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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c683152db7e0d7c93aadc88a1edc55a4ff5cba5e17ecb38248c977cf082daaf' 
  AND token = 'XV8JCYu25COGU2Mbn3eHKjazcifcW+Eh0C25cC5w5t4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}